feat(agents): add sync and redeploy commands (5/8)

[VaibhavAcharya]

Summary

Linear: https://linear.app/netlify/issue/EX-2195

Part 5 of the agents CLI revamp split. Adds two commands that realign or re-run a run's deploy. Ordered before publish/revert because agents:publish reuses the sync flow.

• agents:sync realigns a run with production, auto-picking rebase, merge_target, or sync_git_origin based on runner state. No-ops when already up to date.
• agents:redeploy re-runs the deploy for a run.

$ netlify agents:sync <id> --yes
Checking agent run state...
Nothing to sync, this agent run is already up to date.

# when the production deploy moved on (non-git):
$ netlify agents:sync <id> --yes
✓ Sync started: reapply changes on top of the latest production deploy.

# on a git-backed site with new commits on target:
$ netlify agents:sync <id> --yes
✓ Sync started: merge the latest target branch into this agent run (target: main).

Stacked on the pr/commit PR.

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[VaibhavAcharya]

Link EX-2195